Thcsi u m.] santalace^ (Hill). 1 riV 



Section ]. Imbl'rbia. — Margins of peiianth-aegments entire, glabrous, papilluse, 

 fimbriate or proviJeu with lacinnla?, apical beard absent ; anthers attached to 

 the segments or tube by a tuft of perianth-haii^s adhering to their apices. 



Sub-section 1 . Subglabka. — Perianth-seguients glabrous or fringed with 

 minute papillcC ; antliei-s attached to perianth-segments by a tuft of hairs. 



A 



/ 



Flowers usualh^ single in the bract axils and arranged 

 in simple terminal spikes or racemes : 

 Plant:i \\ ith rigid spine-like branches ; leaves spinous, 

 spinulose, scale-like or if leafy fugacious : 

 Leaves spinous or spinulose : 

 Leaves stout, all spinous : 



Leaves folded, decurreiit (1) spinosum. 



Leaves solid, terete, not decurrent (2) pungens. 



Upper leaves spinulose, lower linear (3) spinulosum. 



Leaves not spinous : 



Braiiehlets spinous ; stems sulcate ; leaves linear, 



fugacious ... ... ... ... ... (4) lineatura. 



Brauchlets spinous ; leaves scale-like ... ••- (5) rigidum. 



Plants not spinous, herbs or sub-ehrubs ; leaves herba- 

 ceous or fleshy : * 

 Flowers with well-marked perianth-tube : 

 Plants hairy --(G) hirsutum. 



Plants glabrous : 



Plants with weak straggling branches ... (7) virens. 



Plants with erect stift" branches : 



Flowers pedunculate ; bracts slightly ad- 

 nate to peduncle ; leaves hard, acutely 

 acuminate ... ... ... ... (8) costatum. 



Flowers sessile or if shortly pedunculate 

 bracts wholly uJuate ; leaves herba- 

 ceous : 

 Stems tall ; leaves J-1^ in. long ... ( 9 ) Nationae. 



Stems short ; leaves 3-5 lin. long ... (10) racemosum. 



Flowers without marked perianth-tube and more 

 or less provided with a disc : 

 Leaves succulent (11) crassifolium. 



Leaves herbaceous : 



Plants minutely scabrous (12) disciflorum. 



Plants glabrous : ' 



Flowers pedicellate in axils of leafy bracts ; 

 bracteoles very small ; hiflorescence in- 

 definite ; bracts not adnate to pedicels (13) namaq^aense. 



Flowers in more or less definite terminal 

 inflorescences ; bracts more or less 

 adnate to pedicels ; bracteoles about 

 equal in length to bracts : 

 Perianth-segments glabrous ; much- 

 branched herbs or sub-shruUs : 

 Slender sub-prostrate herbs ; leaves 

 narrowK' linear, acuminate, as- 

 cending (l^i) acutissimum. 



Stout sub-shrubs ; leaves broadly linear, 



subacute, recurved (15) squarrosum. 



